Portable toilet chemical recharge system and method

ABSTRACT

A portable toilet chemical recharge system and method includes a water source and a main conduit with a water valve, and a liquid chemical solution source with a chemical conduit and a chemical pump, the chemical conduit connected to the main conduit downstream from the water valve. A chemical pump timer engages and disengages the chemical pump, and a chemical flow control valve controls chemical flow through the chemical conduit. The water valve, chemical pump timer and the chemical flow control valve cooperatively control flow through the main and chemical conduits to provide a pre-injection water flush period, a liquid chemical injection period wherein liquid chemical flows into the main conduit, and a post-injection water flush period.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation-in-Part of U.S. patent application Ser. No. 11/657,994, filed on Jan. 25, 2007, which is incorporated in full herein, by reference.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable.

BACKGROUND OF THE INVENTION

1. Technical Field

The present invention is directed to portable chemical toilet recharge systems and methods and, more particularly, to a portable toilet chemical recharge system and method which includes a main conduit connected to a water source, a chemical conduit connected to a liquid chemical source, a water valve operative between and open and closed position interposed in the main conduit between the inflow and outflow ends thereof, a chemical pump interposed in the chemical conduit, the outflow end of the chemical conduit connecting to the main conduit downstream of the water valve, a chemical pump timer operatively connected to the chemical pump, a chemical flow control valve operatively connected to the chemical conduit downstream of the chemical pump for controlling flow of liquid chemicals there through, wherein the chemical pump timer and chemical flow control valve are cooperatively operative to control the flow of chemical through the chemical conduit and into the main conduit. After the water valve is placed in the open position for a pre-injection water flush period, the chemical pump timer initiates operation of the chemical pump and opens the chemical flow control valve for a predetermined liquid chemical injection period where liquid chemical flows through the chemical conduit into the main conduit to mix with the water in the main conduit. The chemical pump timer is operative to close the chemical flow control valve and disengage the chemical pump upon a predetermined amount of liquid chemical being added to the water flow through the main conduit. The water valve is operative in the closed position to stop the flow of water following a post-injection water flush period wherein water flows out of the main conduit.

2. Description of the Prior Art

The portable toilet industry generally requires a water and chemical recharging mixture to be used in the base of the portable toilet to control odor and prevent bacterial growth between servicing periods. There are many different types of chemicals which are used in connection with portable chemical toilets, but generally the chemicals are selected from concentrated solutions of formaldehyde, methanol, glycol, or magnesium chloride-based which can be quite toxic and potentially hazardous, but which are necessary in order to provide the level of bacterial control and odor masking required by the portable chemical toilet industry. In general, the recharge of a portable chemical toilet involves manually combining water and concentrated chemical in an appropriate receptacle, manually mixing the water and chemical, and then adding this chemical/water mixture to the portable chemical toilet. The clear disadvantage of such a process, however, is that it affords numerous opportunities for the concentrated chemical to contact the skin or eyes of the user, and, due to the toxic and concentrated nature of the chemicals, such contact with the skin and/or eyes can cause significant and possibly severe damage. There is therefore a need for a portable chemical toilet recharge system which will generally eliminate risks involved in servicing and recharging chemical toilets while simultaneously providing a simple and efficient system by which recharging may be performed.

Therefore, an object of the present invention is to provide an improved portable toilet chemical recharge system.

Another object of the present invention is to provide a portable toilet chemical recharge system which includes a manually operated water valve, a chemical pump, a chemical pump timer, and a chemical flow control valve which all cooperate to control and regulate chemical and water flow into a portable chemical toilet being recharged by operation of the present invention.

Another object of the present invention is to provide a portable toilet chemical recharge system in which the water valve is placed in the opened position to deliver pre-injection water for flushing of the main conduit, the chemical pump timer initiates operation of the chemical pump and chemical flow control valve for a predetermined liquid chemical injection period where liquid chemical flows through the chemical conduit into the main conduit and the water continues to flow after the chemical pump ceases operating to flush the remaining chemical out of the system.

Another object of the present invention is to provide a portable toilet chemical recharge system which is capable of being operated in a hands-free mode where the operator need not manually mix the concentrated chemicals with the water as the system will perform that operation for the user.

Finally, an object of the present invention is to provide a portable toilet chemical recharge system which is relatively simple and durable in construction and is safe, effective and efficient in use.

BRIEF SUMMARY OF THE INVENTION

The present invention provides a portable toilet chemical recharge system and method including a water source and a main conduit in liquid transmission connection with the water source at the inflow end thereof, the main conduit including a first main conduit section and a second main conduit section. A water valve operable between an open and closed position interposed between the first and second main conduit sections of the main conduit operative in the open position to draw water from the water source through the first main conduit section and allow water to flow onwards through the second main conduit section. The second main conduit section may include an elbow joint 27 at the outflow end. A liquid chemical solution source is connected in liquid transmission connection with a chemical conduit which includes a first chemical conduit section and a second chemical conduit section, and a chemical pump is interposed between the first and second chemical conduit sections of the chemical conduit and is operative to draw liquid chemical from the liquid chemical solution source through the first chemical conduit section and force liquid chemical onwards through the second chemical conduit section. The second chemical conduit section is connected in liquid chemical solution transmission to the second main conduit section whereby liquid chemical is added to the water flowing through the second main conduit section. A chemical pump timer is operative to engage and disengage the chemical pump. Also, a chemical flow control valve is operatively connected to the second chemical conduit section for controlling flow of liquid chemical through the second chemical conduit section. Alternatively, the chemical flow control valve may be positioned in the bend of the elbow joint 27 of the second main conduit section. Finally, the chemical pump timer and the chemical flow control valve are cooperatively operative to control the flow of chemical through the chemical conduit and into the main conduit. After the water valve is placed in the open position for a pre-injection water flush period, the chemical pump timer initiates operation of the chemical pump and opening of the chemical flow control valve for a predetermined liquid chemical injection period wherein liquid chemical flows through the chemical conduit through the chemical flow control valve into the second main conduit section to mix with the water such that the resulting water/chemical mixture flows through the outflow end of the main conduit. The chemical pump timer is operative to close the chemical flow control valve and disengage the chemical pump upon a predetermined amount of liquid chemical being added to the water flow through the main conduit. The water valve is placed in the closed position following a post-injection water flush period during which water flows through the main conduit out of the outflow end of the main conduit.

The present invention as thus described provides many improvements over those recharging devices and systems found in the prior art. Also, because the present invention provides both a pre-injection water flush period and a post-injection water flush period, it is highly unlikely that the chemical will remain in the main conduit. Finally, because the system of the present invention combines the chemical with the water and delivers the desired water chemical mixture to a receptacle, such as a bucket, through the outflow end of the main conduit, it is believed that no special training or practice with the operation of the present invention will be necessary for a user to properly recharge a portable chemical toilet through use of the present invention. It is therefore seen that the present invention provides a substantial improvement over those devices and systems found in the prior art which attempt to perform a similar function.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a partial perspective view of the portable toilet chemical recharge system of the present invention;

FIG. 2 is a partial perspective view of the system of the present invention showing additional elements of the system.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

The portable toilet chemical recharge system 10 of the present invention is shown in FIGS. 1-2 as including a water reservoir 12 and a chemical reservoir 18, with the water reservoir 12 being of any appropriate size, shape and design, although it is expected that a large plastic or metal tank will be used for the water reservoir 12 of the present invention. Likewise, the chemical reservoir 18 may be or any desired size, shape or design, so long as the chemicals held within the chemical reservoir 18 are safely and securely retained therein until released into the system 10 of the present invention. In fact, in many instances, the water reservoir 12 and chemical reservoir 18 would be carried on a vehicle such as a truck to provide a portable recharging system in accordance with the present invention as described below, although such usage is not particularly critical to the present invention.

Extending outwards from water reservoir 12 and in liquid transmission connection therewith is a main conduit 20 which, in one embodiment, would be a hose or tube which is connected to the water reservoir 12 via a valve 14 fitted on the inflow end 22 of main conduit 20, as shown best in FIG. 1. The key requirement for the main conduit 20 is that it provides a steady and unimpeded flow of water from the water reservoir 12, and otherwise the size, shape and construction material used in connection with main conduit 20 is not critical to the present invention. For clarification purposes, it should be noted that the section of main conduit 20 which extends between the water reservoir 12 and water valve 42 will be referred to as the first main conduit section 24.

The chemical reservoir 18 is connected to the main pump housing 30 via a chemical conduit 26 which, in one embodiment, would be a tube or hose of narrower diameter than that used in connection with main conduit 20 and would generally be constructed of a chemically non-reactive material to ensure that the chemical being transferred between the chemical reservoir 18 and main pump housing 30 will not be accidentally released. For clarification purposes, the section of the chemical conduit 26 which extends between the chemical reservoir 18 and main pump housing 30 will be referred to as the first chemical conduit section 28.

The chemical conduit 26, specifically first chemical conduit section 28, feeds into the main pump housing 30 and proceeds to chemical pump 50 shown in FIG. 2 which is likely mounted adjacent the water valve 42 yet, of course, may be moved to any position within the main pump housing 30 as desired by the manufacturer and/or user of the present invention. In one embodiment, the chemical pump 50 would be a standard 12-volt pump design which is operative to draw the chemical out of the chemical reservoir 18 through first chemical conduit section 28 of chemical conduit 26 and force the chemical solution through the second chemical conduit section 29 of chemical conduit 26 which extends downstream from the chemical pump 50. The important consideration with chemical pump 50 from an operational standpoint is that the chemical pump 50 needs to be capable of outputting a measurable flow of the chemical solution so that the a predetermined amount of chemical solution may be combined with the water flowing through main conduit 20 as will be described herein. Therefore, the precise size, shape and design of chemical pump 50 is not particularly critical to the present invention so long as the chemical pump 50 functions to provide the measurable flow of chemical solution therefrom.

The second chemical conduit section 29 feeds out from the chemical pump 50 into a solenoid valve 56 which, in the preferred embodiment, would function to precisely control flow of the chemical solution through the chemical conduit 26 into the main conduit 20 at the point where the second chemical conduit section 29 of chemical conduit 26 connects with the second main conduit section 25 of main conduit 20 at the T-joint 58 adjacent solenoid valve 56. The resulting chemical/water mixture would then flow through the second main conduit section 25 of main conduit 20, as shown best in FIG. 1. In one embodiment, the second main conduit section 25 of the main conduit 20 may include an elbow joint 27, near the output end where solenoid valve 56 is positioned in liquid communication with the elbow joint 27.

It should be noted that it is preferred that fresh water be used in connection with the present invention. Furthermore, the chemical used in connection with the present invention would preferably be a formaldehyde, methanol, glycol, or magnesium chloride-based liquid solution which is designed to provide the level of bacterial control and odor masking required by the portable chemical toilet industry. The particular chemicals to be used in specific situations would be understood by one skilled in the art of portable chemical toilets, and therefore further discussion of the specific nature of the chemicals used in connection with the present invention is not necessary.

Operation of the chemical pump 50, and solenoid valve 56 is controlled by at least one timing device, specifically a chemical pump timer 80 which is in electronic information transmission connection with the chemical pump 50, and solenoid valve 56. In one embodiment, the chemical pump timer 80 would be an electronic timing device which functions as standard electronic timer. Any timers known in the art, such as mechanical or digital timers may be used in the practice of the invention. In this example, chemical pump timer 80 is connected to a power source 90 which, in one embodiment, would be a 12-volt battery or the like, as has been found that a 12-volt battery provides sufficient electrical power for functioning of the present invention. Of course, however, other sources of electrical power may be used in connection with the present invention so long as the proper operating voltages and amperages are provided to the various elements of the present invention to permit them to function as intended.

As shown best in FIG. 1, the chemical pump timer 80 would be mounted in the plastic box 32 of main pump housing 30, either in the lid 34 or in a top tray mounted within the main pump housing 30, to provide easy access to the chemical pump timer 80 while mounting it in a protected location within the main pump housing 30. It should be noted, however, that FIG. 1 illustrates the chemical pump timer 80 being mounted in the lid 34 of plastic box 32 of main pump housing 30 so that those elements may be more easily viewed. Because the chemical pump 50 pumps its liquid at a steady rate, the chemical pump timer 80 may turn the chemical pump 50 on and off to control the amount of liquid, which is being pumped into the second main conduit section 25 and into a receptacle. Specifically, the adjustment dial 82 on chemical pump timer 80 may be adjusted such that the desired amount of chemical is added to the waterflow. For example, anywhere from as little as one ounce of chemical to as much as ten ounces of chemical may be added to the water flow through main conduit 20 by adjusting the duration of the engagement time of chemical pump 50 via the chemical pump timer 80. The chemical pump timer 80 would function in a manner that current flow to the chemical pump 50, would be controlled via the chemical pump timer 80, thereby disengaging or engaging the chemical pump 50. Alternatively, multiple timers (not shown) may be provided in the system 10 with user set duration times, where the user merely selects the appropriate timer with the desired pre-set time to operate chemical pump 50.

It should also be noted, however, that the chemical pump timer 80 is operatively connected to the solenoid valve 56, to control the opening and closing of solenoid valve 56 by operation of the chemical timer 80. Specifically, when the chemical pump timer 80 engages the chemical pump 50, it also opens solenoid valve 56 to permit chemical to flow through the chemical conduit 26, specifically through second chemical conduit section 29 towards and into the main conduit 20. When the chemical pump timer 80 shuts off the chemical pump 50, it simultaneously shuts the solenoid valve 56 thereby accurately controlling the amount of chemical being injected into the main conduit 20, specifically into the water flow within main conduit 20. The primary purpose for solenoid valve 56 is to completely prevent addition of chemical to the water flowing through main conduit 20 once the chemical pump timer 80 disengages the chemical pump 50, although it should be noted that other types of valves may be substituted for the solenoid valve 56 as described herein so long as the intended function of preventing unintended addition of chemical to the water flow is maintained.

In one embodiment, the portable toilet chemical recharge system 10 of the present invention would function in the following manner. The operator would initially set the adjustment dial 82 of the chemical pump timer 80 to the desired setting so that the appropriate and predetermined amount of chemical is added to water for the portable chemical toilet being recharged. For example, a standard setting for the chemical pump timer 80 would be to set the adjustment dial 82 such that approximately five ounces of chemical would be mixed with the water for putting into the portable chemical toilet being recharged. The portable toilet chemical recharge system 10 would them be turned on via power switch 88 which sends power to the chemical pump timer 80 found within the system, the power being fed from the power supply 90. This then energizes the chemical pump timer 80 immediately or soon after activation of the system.

The chemical pump timer 80 engages the chemical pump 50 and solenoid valve 56 to inject chemical from the chemical reservoir 18 through chemical conduit 26 into the main conduit 20 at the T-joint 58, in a predetermined liquid chemical injection amount. Depending on the flow rate of chemical pump 50, the injection period may be brief or somewhat extended so long as the intended injection of the preset amount determined by the adjustment dial 82 on chemical pump timer 80 is the amount which is actually injected into the main conduit 20. Once the chemical pump timer 80 times out, the chemical pump timer 80 sends a signal to chemical pump 50 and solenoid valve 56 which disengages chemical pump 50 and shuts solenoid valve 56 so that no more chemical may enter the chemical conduit 26 or main conduit 20. However, the user allows water to continue to flow, thus flushing the main conduit 20 for a post-injection water flush period. At this point, the water valve 42 is closed, thus stopping further flow of water. Reactivation of the system 10 occurs when the power switch 88 is turned off and then turned on again and the system 10 is once again ready to deliver the desired amount of water and chemical into a receptacle.

It should be noted that numerous additions, modifications and substitutions may be made to the portable toilet chemical recharge system 10 of the present invention which fall within the intended broad scope of the appended claims. For example, the size, shape, operational capabilities and functional characteristics of the elements of the present invention may be modified or changed so long as the intended function of the present invention is maintained, namely the facilitated recharging of chemical toilets. Also, it may be preferable to provide a mounting rack system 96 to support the various elements of the present invention in adjacent configuration as shown in FIGS. 1 and 2, although the use of such a mounting rack system 96 is not critical to the present invention. Furthermore, the present invention may include a cycle completion counter 84 which tracks the number of cycles which have been performed by the present invention, activation of which would be tied into not only the activation of the present invention, but specifically into the completion of each recharge cycle performed by the present invention, which is the more critical count, and the inclusion of such a cycle completion counter 84, as shown in FIG. 1, would be understood by one skilled in the art of such counting devices. It should also be noted that although the present invention may be used to recharge both flushing and non-flushing portable chemical toilets, it can be used for other purposes beyond the recharging of toilets, should such uses become apparent to users of the present invention.

While specific embodiments have been shown and discussed, various modifications may of course be made, and the invention is not limited to the specific forms or arrangement of parts and steps described herein, except insofar as such limitations are included in the following claims. Further, it will be understood that certain features and subcombinations are of utility and may be employed without reference to other features and subcombinations. This is contemplated by and is within the scope of the claims. 

1. A portable toilet chemical recharge system comprising: a water source; a main conduit in liquid transmission connection with said water source at the inflow end thereof, said main conduit including a first main conduit section and a second main conduit section; a water valve operative in an open and closed position and interposed between said first and second main conduit sections of said main conduit operative to allow the flow of water from said water source through said first main conduit section and onwards through said second main conduit section; a liquid chemical solution source; a chemical conduit in liquid transmission connection with said liquid chemical solution source, said chemical conduit including a first chemical conduit section and a second chemical conduit section; a chemical pump interposed between said first and second chemical conduit sections of said chemical conduit operative to draw liquid chemical from said liquid chemical solution source through said first chemical conduit section and force liquid chemical onwards through said second chemical conduit section; said second chemical conduit section connected in liquid chemical solution transmission to said second main conduit section whereby liquid chemical is added to the water flowing through said second main conduit section; a chemical pump timer operative to engage and disengage said chemical pump; a chemical flow control valve operatively connected to said second chemical conduit section for controlling flow of liquid chemical through said second chemical conduit section; said chemical pump timer and said chemical flow control valve operative to control liquid flow through said main conduit and said chemical conduit with said water valve set to an opened position initiating the flow of water for a pre-injection water flush period wherein water flows through said main conduit, said chemical pump timer initiating operation of said chemical pump and opening of said chemical flow control valve for a predetermined liquid chemical injection period wherein liquid chemical flows through said chemical conduit through said chemical flow control valve into said main conduit to mix with said water such that the resulting water/chemical mixture flows out of said outflow end of said main conduit, said chemical pump timer operative to close said chemical flow control valve and disengage said chemical pump upon a predetermined amount of liquid chemical being added to the water flow through said main conduit, said water valve set to a closed position stopping the flow of water following a post-injection water flush period.
 2. The portable toilet chemical recharge system of claim 1 wherein said chemical flow control valve is a solenoid valve.
 3. The portable toilet chemical recharge system of claim 1 wherein said pre-injection water flush period is between approximately one and approximately ten seconds.
 4. The portable toilet chemical recharge system of claim 1 wherein operation of said chemical pump during said predetermined liquid chemical injection period results in injection of between approximately one to approximately ten ounces of chemical into said main conduit.
 5. The portable toilet chemical recharge system of claim 1 wherein said water valve is set in the open position during said pre-injection water flush period, said predetermined liquid chemical injection period and said post-injection water flush period and results in flow of between approximately one to approximately seven gallons of water from said water source.
 6. A portable toilet chemical recharge system comprising: a water source; a main conduit in liquid transmission connection with said water source at the inflow end thereof, said main conduit including a first main conduit section and a second main conduit section; a water valve interposed between said first and second main conduit sections of said main conduit operative to allow water to flow from said water source through said first main conduit section and onwards through said second main conduit section; a liquid chemical solution source; a chemical conduit in liquid transmission connection with said liquid chemical solution source, said chemical conduit including a first chemical conduit section and a second chemical conduit section; a chemical pump interposed between said first and second chemical conduit sections of said chemical conduit operative to draw liquid chemical from said liquid chemical solution source through said first chemical conduit section and force liquid chemical onwards through said second chemical conduit section; said second chemical conduit section connected in liquid chemical solution transmission to said second main conduit section whereby liquid chemical is added to the water flowing through said second main conduit section; a chemical pump timer operative to engage and disengage said chemical pump; a chemical flow control valve operatively connected to said second chemical conduit section for controlling flow of liquid chemical through said second chemical conduit section; a switch operatively interposed between an electrical power source and the chemical pump timer for engaging said chemical pump timer by permitting electricity to flow to the timer upon said switch being engaged; said switch, said chemical pump timer and said chemical flow control valve operative to control liquid flow through said main conduit and said chemical conduit with said water valve on the open position for a pre-injection water flush period wherein water flows through said main conduit, said chemical pump timer then initiating operation of said chemical pump and opening of said chemical flow control valve for a predetermined liquid chemical injection period wherein liquid chemical flows through said chemical conduit through said chemical flow control valve into said main conduit to mix with said water such that the resulting water/chemical mixture flows out of said outflow end of said main conduit, said chemical pump timer then operative to close said chemical flow control valve and disengage said chemical pump upon a predetermined amount of liquid chemical being added to the water flow through said main conduit, said water valve placed in the closed position following a post-injection water flush period wherein water flows out of or into said outflow end of said main conduit.
 7. The portable toilet chemical recharge system of claim 6 wherein said chemical flow control valve is a solenoid valve.
 8. The portable toilet chemical recharge system of claim 6 wherein operation of said chemical pump during said predetermined liquid chemical injection period results in injection of between approximately one to approximately ten ounces of chemical into said main conduit.
 9. The portable toilet chemical recharge system of claim 6 wherein said water valve is set in the open position during said pre-injection water flush period, said predetermined liquid chemical injection period and said post-injection water flush period results in flow of between approximately one to approximately seven gallons of water from said water source.
 10. A method of chemically recharging a portable toilet, said method comprising: a. providing a water valve operable to allow water to flow from a water source; b. moving said water from said water source for a pre-injection water flush period, said water flowing from said water source through a main conduit, said main conduit comprising a first main conduit section and a second main conduit section, wherein said water is drawn from said water source through said first main conduit section and onward through said second main conduit section; c. providing a chemical pump operable to transfer liquid chemical solution from a liquid chemical solution source; d. pumping said liquid chemical solution from said liquid chemical solution source for a predetermined liquid chemical injection period, said liquid chemical solution flowing from said liquid chemical solution source through a chemical conduit, said chemical conduit comprising a first chemical conduit section and a second chemical conduit section, wherein said liquid chemical solution is drawn from said liquid chemical solution source through said first chemical conduit section and forced onward through said second chemical conduit section; e. introducing said liquid chemical solution into said water through said second main conduit section via said second chemical conduit section connected in fluid transmission to said second main conduit section such that the resulting water/chemical mixture flows out of said main conduit; f. discontinuing the pumping of said liquid chemical solution at the conclusion of the predetermined liquid chemical injection period, such that a predetermined amount of liquid chemical solution was added to the water flowing through said main conduit; and g. discontinuing the flow of said water from said water source following a post-injection water flush period.
 11. The method of claim 10 further comprising: engaging a chemical pump timer by permitting electricity to flow to said chemical pump timer upon a switch being engaged, said chemical pump timer operative to engage and disengage said chemical pump for pumping said liquid chemical solution.
 12. The method of claim 10 wherein said chemical conduit section further comprises a chemical flow control valve operatively connected to said second chemical conduit section for controlling the flow of liquid chemical solution through said second conduit section.
 13. The method of claim 10, further comprising: engaging said chemical pump timer and said chemical flow control valve by permitting electricity to flow to said chemical pump timer upon a switch being engaged, said water valve operative in and open and closed position for controlling the flow of water and said chemical pump timer operative to engage and disengage said chemical pump for pumping said liquid chemical solution such that said chemical pump timer initiates operation of said chemical pump and the opening of said chemical flow control valve for said predetermined liquid chemical injection period, wherein liquid chemical solution flows through said chemical conduit through said chemical flow control valve into said main conduit and said chemical pump timer is operative to close said chemical flow control valve and disengage said chemical pump upon a predetermined amount of liquid chemical solution being added to the water flowing through said main conduit and said water valve stops the flow of water following said post-injection water flush period wherein water flows through said main conduit.
 14. The method of claim 10, wherein said pre-injection water flush period is between approximately one and approximately ten seconds.
 15. The method of claim 10, wherein said predetermined liquid chemical injection period results in injection of between approximately one to approximately ten ounces of chemical into said main conduit.
 16. The method of claim 10, wherein said pre-injection water flush period, said predetermined liquid chemical injection period and said post-injection water flush period results in flow of between approximately one to approximately seven gallons of water from said water source.
 17. A method of chemically recharging a portable toilet, said method comprising: a. initiating the flow of water using a water valve for a pre-injection water flush period wherein water flows through a main conduit, said water valve interposed between a first and a second main conduit section of said main conduit operative to allow the flow of water from a water source through said first main conduit section and said second main conduit section; b. initiating the operation of a chemical pump using a chemical pump timer and opening of a chemical flow control valve for a predetermined liquid chemical injection period, said chemical pump interposed between said first and second chemical conduit sections of said chemical conduit operative to draw liquid chemical solution from said liquid chemical solution source through said first chemical conduit section and force liquid chemical solution onwards through said second chemical conduit section, said second chemical conduit section connected in liquid chemical solution transmission to said second main conduit section whereby liquid chemical solution is added to the water flowing through said second main conduit section, wherein liquid chemical flows through said chemical conduit through said chemical flow control valve into said main conduit to mix with said water such that the resulting water/chemical mixture flows through an outflow end of said main conduit; c. discontinuing operation of said chemical pump and closing said chemical flow valve by said chemical pump timer such that a predetermined amount of liquid chemical solution is added to the water flowing through said main conduit; d. discontinuing the flow of water by closing said water valve following a post-injection water flush period wherein said water flows through said main conduit.
 18. The method of claim 17, further comprising: simultaneously opening said water valve and engaging said chemical pump timer and said chemical flow control valve by permitting electricity to flow to the timer upon a switch being engaged, said chemical pump timer operative to engage and disengage said chemical pump for pumping said liquid chemical solution such that said chemical pump timer initiates operation of said chemical pump and the opening of said chemical flow control valve for said predetermined liquid chemical injection period, wherein liquid chemical solution flows through said chemical conduit through said chemical flow control valve into said main conduit, and said chemical pump timer is operative to close said chemical flow control valve and disengage said chemical pump upon a predetermined amount of liquid chemical solution being added to the water flowing through said main conduit, and closing said water valve following said post-injection water flush period wherein water flows through said main conduit.
 19. The method of claim 17, wherein said predetermined liquid chemical injection period results in injection of between approximately one to approximately ten ounces of chemical into said main conduit.
 20. The method of claim 17, wherein said pre-injection water flush period, said predetermined liquid chemical injection period and said post-injection water flush period results in flow of between approximately one to approximately seven gallons of water from said water source. 